Yes they are and TV cable is 75 ohm instead of 50 ohm for WiFi and the stuff (Transmitters, FPV, Etc.) we use.
Thurmond
How to build a 5.8GHz Helical Antenna
- Thread starter Danger Mouse
- Start date
Yes they are and TV cable is 75 ohm instead of 50 ohm for WiFi and the stuff (Transmitters, FPV, Etc.) we use.
Thurmond
bmsweb
Site Moderator
Hi colorex
The only SMA connectors available here are in fact gold plated.
Jase at the price we get them for, I'm thinking they are 100% gold
I'm made one of these that looks EXACTLY like yours!! Can't wait to try it out!
Thanks Man!!!!!!
zann68
New member
It's all soldered together. It looks odd in the picture. The sma mount pins are soldered in place as well the coil. The dab of hot glue was to help keep it from rotating I found the pin in the sma would allow the coil to rotate. Hopefully I can test it out this coming weekend. We had 5" of rain here in Alabama this weekend and still more to come.
Danger Mouse
Member
Hi zann68
The reason I would suggest not using hot glue around the SMA Reverse PCB – Plug is that it may it affect the antennas performance. Specifically, it could possibly shift the resonance frequency and or affect the Wavetrap.
I hope this clarifies things
Cheers
Jase
PS I hope it stops raining
The reason I would suggest not using hot glue around the SMA Reverse PCB – Plug is that it may it affect the antennas performance. Specifically, it could possibly shift the resonance frequency and or affect the Wavetrap.
I hope this clarifies things
Cheers
Jase
PS I hope it stops raining
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Hey DM, I'm new to helical antennae but I've noticed in other versions that the bottom of the coil runs parallel to the reflector board 2mm above (or so) for 1/4 of the coil, yours does not... why is that? Also, is .8mm Mig wire ok to use? Also, what thickness copper sheet for the wave trap?
Thanks mate, Carl.
Thanks mate, Carl.
Danger Mouse
Member
Hi kiwi carl
The first 1/4 turn of the coil does not sit 2mm above the reflector because I've found that given the size of the 5.8GHz helical it was impractical to achieve. Just my personal experience. As for the 0.8mm MIG Wire. I would suggest this would be too thin. Most hobby shops stock 1/16in Copper Round and it is inexpensive. I hope this helps.
Regards DM
The first 1/4 turn of the coil does not sit 2mm above the reflector because I've found that given the size of the 5.8GHz helical it was impractical to achieve. Just my personal experience. As for the 0.8mm MIG Wire. I would suggest this would be too thin. Most hobby shops stock 1/16in Copper Round and it is inexpensive. I hope this helps.
Regards DM
Hey DM, just sent this is a message to you...
Hey dude, just wondering what thickness is the wave trap in that build guide you created? It's just that the link to the web site that's in the materials list says its .0259" which makes it .6mm thick which you can't cut with a knife...
Cheers, Carl
Hey dude, just wondering what thickness is the wave trap in that build guide you created? It's just that the link to the web site that's in the materials list says its .0259" which makes it .6mm thick which you can't cut with a knife...
Cheers, Carl
Danger Mouse
Member
Hi kiwi carl
It is basically thin sheet.
Cheers
DM
It is basically thin sheet.
Cheers
DM
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Danger Mouse
Member
Hi kiwi carl
Good luck.
Cheers
DM
Good luck.
Cheers
DM
Danger Mouse
Member
Hi Gang
I thought you might find the following table useful.
Cheers
DM
I thought you might find the following table useful.
Cheers
DM
Or....this just available from HK
http://www.hobbyking.com/hobbyking/...r_Polarized_Clover_Leaf_spiroNet_Antenna.html
What a deal!
http://www.hobbyking.com/hobbyking/...r_Polarized_Clover_Leaf_spiroNet_Antenna.html
What a deal!
Nonamerc
Arman
Some people on dutch forums have tested these and they are getting more range with it then the normall antennas. What a cheap price I think that videoaerialsystems wil sell a lot less cp antennas now! Just waiting for the 1.2 GHz Biquad and the 1.2 GHz inverted vee. Also I think that if they add more antennas such as the helicall and the biquad that they are going to 'steal' allot of costumers from videoaerialsystems and circular wireless!
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It would appear that the table is the Angle above horizontal (parallel to ground) to set your antenna.
Example: if your plane is 100 meters high and 1000 meters away then the antenna needs to be 5.71 degrees above parallel with the ground to be pointed directly at your plane or craft.
Thurmond
ilovetoflyfpv
Member
Hi kiwi carl
Tritium is correct.
Cheers
Jason (formally Danger Mouse)
Tritium is correct.
Cheers
Jason (formally Danger Mouse)
Thanks guys.
Hey I'd like to make an 8turn 5.8ghz heli, can I simply add more turns to this current design? What size will I need to make reflector?
Thanks, Carl.
Hey I'd like to make an 8turn 5.8ghz heli, can I simply add more turns to this current design? What size will I need to make reflector?
Thanks, Carl.
ilovetoflyfpv
Member
Hi kiwi carl
Yes you can simply add more turns. The reflector size will remain the same. Keep in mind that although this will increase the gain it will also reduce the beam width.
Cheers
Jason
Yes you can simply add more turns. The reflector size will remain the same. Keep in mind that although this will increase the gain it will also reduce the beam width.
Cheers
Jason
Cheers dude, one other question, what's the tolerance on the diameter of this antenna?
ilovetoflyfpv
Member
Hi kiwi carl
Are you referring to the diameter of the copper tube or the diameter of the coil? I've found for this size of antenna 2mm diameter coil strikes a good balance between pliability and rigidity. As for the diameter of the coil, the closer to the diameter of the forma the better.
I hope this helps.
Cheers
Jason
Are you referring to the diameter of the copper tube or the diameter of the coil? I've found for this size of antenna 2mm diameter coil strikes a good balance between pliability and rigidity. As for the diameter of the coil, the closer to the diameter of the forma the better.
I hope this helps.
Cheers
Jason
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